From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-12.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D00FCC433E2 for ; Thu, 17 Sep 2020 16:35:53 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 6A989206BE for ; Thu, 17 Sep 2020 16:35:53 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="ZQFF8kD2" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 6A989206BE Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:46882 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kIwsx-00050z-Hu for qemu-devel@archiver.kernel.org; Thu, 17 Sep 2020 12:35:51 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:52598) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kIwor-0000g6-Hi for qemu-devel@nongnu.org; Thu, 17 Sep 2020 12:31:37 -0400 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:52891) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1kIwon-0000wM-8I for qemu-devel@nongnu.org; Thu, 17 Sep 2020 12:31:37 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1600360290; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=hoKGRGT2V6fv30rJh8pJxgu9hLwQjaS3tEMU4jSGQIA=; b=ZQFF8kD2q2asTYxThS/xv6Es/xDt+5rnh2wdJT1eKYJrrfZxlBg1/Zzrkq7hXgKSJoD0Ky Bgg4OSkALmVXF+38fBLyqTC1ZR0pxBIetDVEzv0eV2RXyJs390OgexcH97CeAQRnrcdfre a/Pqd+XSLWDS88MSKGbZCK9qB+hX6FM= Received: from mail-wm1-f69.google.com (mail-wm1-f69.google.com [209.85.128.69]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-227-49SMtp39My2o844oh3QTtg-1; Thu, 17 Sep 2020 12:31:29 -0400 X-MC-Unique: 49SMtp39My2o844oh3QTtg-1 Received: by mail-wm1-f69.google.com with SMTP id t8so705813wmj.6 for ; Thu, 17 Sep 2020 09:31:28 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=hoKGRGT2V6fv30rJh8pJxgu9hLwQjaS3tEMU4jSGQIA=; b=X86wQ4njdkALt999FGaFYbpcJcZcAnE9GAnjMgMsWLvA6m/GVvs5Tbc2ZU7gZfrNgW u9rt52epWCRMU/7+2ej6DehjhuvoiGtnGFYvu2dL62DF5q+beKmE4xo+5sl1/iYtzzmq yLb987K3oAsv+ZdJXFGC+vZyBjXuHt+jd5VYsBu+CZ69CxiOmSuDaFTS9hwTQCRpnqod HCjyIS03+pVz4aXNychvMj1lqdDYGM+OgcV+b2tcqOmFjzNy+jMazL+ljIrn+/4J+w2Q eJfROSmVyc1TZQmeLNasLvJGVmTJNNg08lrgx4WMJ6M/s1bF1GfOIZJLQTTp4PjiD3Zf Yo8Q== X-Gm-Message-State: AOAM533SIQBvLL4LItkh5rj5oO5E1SQeOiJSpGOoM2CAsvU3V4gSop68 Buf+zwSpwd0llnss2ehRdjpDHsOmh7TVIvEUKpLtuFtehTMyaoTkxCD0DZeUL9+YQr5hCbMGKwP hLqNPiqg1IxJ7CM4= X-Received: by 2002:a05:6000:12c3:: with SMTP id l3mr35041007wrx.164.1600360287755; Thu, 17 Sep 2020 09:31:27 -0700 (PDT) X-Google-Smtp-Source: ABdhPJxXPAP0gqwaUGtUWZKXaggU2xICD+f79soDWmMyd2fwP1yolvt5oTi7L6fQSKK2/5UDxgx7ZA== X-Received: by 2002:a05:6000:12c3:: with SMTP id l3mr35040986wrx.164.1600360287607; Thu, 17 Sep 2020 09:31:27 -0700 (PDT) Received: from x1w.redhat.com (65.red-83-57-170.dynamicip.rima-tde.net. [83.57.170.65]) by smtp.gmail.com with ESMTPSA id b11sm154973wrt.38.2020.09.17.09.31.26 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 17 Sep 2020 09:31:27 -0700 (PDT) From: =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= To: qemu-devel@nongnu.org Subject: [PATCH 4/4] qemu/bswap: Let cpu_to_endian() functions handle constant expressions Date: Thu, 17 Sep 2020 18:31:06 +0200 Message-Id: <20200917163106.49351-5-philmd@redhat.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200917163106.49351-1-philmd@redhat.com> References: <20200917163106.49351-1-philmd@redhat.com> MIME-Version: 1.0 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=philmd@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=UTF-8; text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=216.205.24.124; envelope-from=philmd@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/09/17 02:01:40 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -50 X-Spam_score: -5.1 X-Spam_bar: ----- X-Spam_report: (-5.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-2.997, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Stefan Hajnoczi , Peter Maydell , Richard Henderson , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" cpu_to_endian() and endian_to_cpu() can be extended to handle constant expressions. That way the programmer doesn't need to remember the const_X() API exists. Suggested-by: Stefan Hajnoczi Signed-off-by: Philippe Mathieu-Daudé --- include/qemu/bswap.h | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/include/qemu/bswap.h b/include/qemu/bswap.h index de256cea3ab..8827e4760b9 100644 --- a/include/qemu/bswap.h +++ b/include/qemu/bswap.h @@ -191,12 +191,16 @@ static inline void bswap64s(uint64_t *s) #define CPU_CONVERT(endian, size, type)\ static inline type endian ## size ## _to_cpu(type v)\ {\ - return glue(endian, _bswap)(v, size);\ + return __builtin_constant_p(v) ?\ + const_ ## endian ## size(v) :\ + glue(endian, _bswap)(v, size);\ }\ \ static inline type cpu_to_ ## endian ## size(type v)\ {\ - return glue(endian, _bswap)(v, size);\ + return __builtin_constant_p(v) ?\ + const_ ## endian ## size(v) :\ + glue(endian, _bswap)(v, size);\ }\ \ static inline void endian ## size ## _to_cpus(type *p)\ -- 2.26.2